I literally just went through this. its absolutely terrible to go through it. don't let him get to you. you have to leave him sadly. I love my fiancee so much but well....it obviously isn't me that he wants for the rest of his life if he has to seek out other women. find someone who will respect and love you like you deserve to be. I cried. so freaking much when I left him. but in the end I felt better and I realized just how much in our relationship had gone wrong. he and I had been together since I was in 8th grade and I'm a senior now. Just make the best of it. I know its really hard to do. I couldn't go to school for like a week when I split up with him but its helped me a lot. I'm not constantly worried about who he's talking to or what he's doing behind my back..